A really interesting plot could be that Harry is actually part - dragon due to some ancient magic. And he has to come to terms with this new identity while also dealing with the regular threats in the wizarding world. This would change his relationship with his friends, his magical abilities, and his place in the wizarding community.
One idea could be a dragon that forms a bond with Harry and helps him in his battles against Voldemort. Maybe the dragon has some special powers that are crucial for Harry to win.
There could be a plot where Harry discovers a hidden dragon sanctuary within Hogwarts that has been a secret for centuries. And he has to protect it from dark wizards who want to use the dragons for evil purposes. This could involve a lot of adventures and magical encounters within the school grounds.
Maybe the dark forces in the Harry Potter world are somehow connected to a threat on Pern. So, Harry and his friends travel to Pern to team up with the dragon riders. They could combine spells like the Patronus charm with the dragon riders' fire - breathing dragon attacks to fight off the common enemy. This would create a really exciting crossover of magic and dragon - riding action.
The OC could be an exchange student from a far - off wizarding school known for its dragon - taming curriculum. At Hogwarts, they find that the dragons here are different in nature. They start a project to cross - train the Hogwarts dragons with the techniques from their home school. This causes a stir among the students, especially those in Care of Magical Creatures class, and also catches the attention of some of the more devious characters in the wizarding world who want to use the OC's knowledge for their own evil purposes.
Perhaps a fanfic where a dragon handler has to deal with a newly hatched and extremely rare dragon species. The handler must figure out its unique needs and abilities, all while keeping it a secret from the Ministry of Magic, which might want to use the dragon for its own purposes. This could lead to a story full of mystery and danger.
One plot idea could be that the fem dragon is a guardian of an ancient wizarding artifact. Harry discovers this and has to team up with the dragon to protect it from dark wizards. Another idea is that the dragon is an outcast in the magical world and Harry befriends it, leading to a story about acceptance and friendship.
One idea could be a story where a young wizard discovers an ancient dragon egg in the Forbidden Forest. He secretly raises the dragon and they form an unbreakable bond. As the dragon grows, they face challenges from Hogwarts faculty who fear the dragon's power. But together, they prove that the dragon can be a force for good.
One idea could be a story where Harry discovers he has an ancient dragon knight heritage. He then has to learn the ways of the dragon knights in secret while still dealing with Voldemort. Another could be that a dragon knight from the past is reincarnated as Harry, and he has to use his past skills to fight new threats at Hogwarts.
One idea could be a dragon guarding a mysterious puzzle that holds the key to an ancient magic. The main characters, like Harry and his friends, have to solve the puzzle while also taming the dragon. Maybe the puzzle is made of dragon scales and only a true Gryffindor can figure it out.
One idea could be a character who discovers they have a unique bond with a dragon that no one else in the wizarding world has. This could lead to them having to hide the dragon from authorities like the Ministry of Magic while also trying to understand the dragon's powers and how it can be used for good.
One interesting plot idea could be the discovery of a hidden connection between Harry Potter and the Dragon King. Maybe the Dragon King has some long - lost magic that only Harry can unlock, leading to a whole new adventure in the wizarding world.
One idea could be a mage who can communicate with dragons and uses this ability to help Harry Potter in a secret mission. For example, the mage could get the dragons to guard Hogwarts during a big attack.